dev, user: user.sys refactors.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/dev/user/src/SystemCalls+IO.asm b/dev/user/src/SystemCalls+IO.asm
new file mode 100644
index 00000000..58ea79e7
--- /dev/null
+++ b/dev/user/src/SystemCalls+IO.asm
@@ -0,0 +1,52 @@
+;; /*
+;; *	========================================================
+;; *
+;; *	libsci
+;; * 	Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+;; *
+;; * 	========================================================
+;; */
+
+[bits 64]
+
+;; @brief Syscall dispatch, also taking note the Microsoft's calling convention to translate it to NeKernel's ABI.
+
+section .text
+
+global sci_syscall_arg_1
+global sci_syscall_arg_2
+global sci_syscall_arg_3
+global sci_syscall_arg_4
+
+sci_syscall_arg_1:
+    mov r8, rcx
+    syscall
+    ret
+
+sci_syscall_arg_2:
+    mov r8, rcx
+    mov r9, rdx
+    syscall
+    ret
+
+sci_syscall_arg_3:
+    mov rbx, r8
+
+    mov r8, rcx
+    mov r9, rdx
+    mov r10, rbx
+
+    syscall
+    ret
+
+sci_syscall_arg_4:
+    mov rbx, r8
+    mov rax, r9
+
+    mov r8, rcx
+    mov r9, rdx
+    mov r10, rbx
+    mov r11, rax
+
+    syscall
+    ret